Platform framing

[elewis33]

I'm getting ready to do the framing for the circular part of my platform. I have a 30'x32' deck and putting the circular platform on top of the deck. See attached image.

So far all I have is a basic framing layout for the 2"x4" part of the platform. I plan to fill in with blocking every 3-4 feet to add structural support for the next layer of OSB, strategically placed on the seams. I'm using tongue/groove OSB for the sub-floor.

My question is: do any of you have tips for how to block the ends (outside edges of the circle) of the framing, so you get the most support and don't end up having to cut tons of crazy angles? Or do you just bite the bullet and cut angles on both ends of the blocking and get them as close to the edge as possible?